Folks, while restoring data after a FW upgrade, the best bet is to restore only the data like contacts, calendar, messages etc from the backup. Settings and 3rd party apps are best reinstalled/re-entered manually. This is a drag, but is the best practice, to make sure that the new FW recreates the internal entries related to the 3rd party apps & settings afresh.
This is based on personal experience from FW updates to my E90, and general gyan from the various Symbian forums. Some people even suggest that you hard-reset the phone immediately after the FW update before you do anything else.
If you've updated the FW and are having enough problems to drive you nuts, you can maybe try hard-resetting the phone, reloading the 'data' only and then reinstalling the 3rd party apps & entering the various settings afresh. It might solve things. Since you have the earlier backup with you anyway, nothing (except a bit of time) is lost.
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